Malicious PDF — malware analysis report

Static analysis result for SHA-256 30dcdfa7c1f9a7a5…

MALICIOUS

PDF

89.6 KB Created: 2021-09-16 21:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c48f06ce87ccd0e62471c9e7abd38844 SHA-1: 8127493d35e51f27e87f6362aadf764d0170fe62 SHA-256: 30dcdfa7c1f9a7a5463c028eeb989e49c91658105fcae43f85cf49ef2c89ea3b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates a social engineering attack that instructs the user to execute a command, likely to bypass macro restrictions. The presence of numerous links to compromised CMS upload storage and disposable hosting suggests a link farm used for distributing malicious content. While no scripts were directly extracted, the PDF structure and heuristics point towards exploitation for client execution, potentially involving embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9826

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135139486b28---79429946141.pdf In PDF document text
    • http://salt17.com/userfiles/files/dopafexitesedi.pdfIn PDF document text
    • https://petikdaun.com/contents/files/64675220502.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/zubexasogozonagibozorebe.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/kidupogakeduv.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210903_20DF35660AE2E3EC.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/xuguwibazinaf.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/puzobogalidaxerivepeferi.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/57605395170.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/6552603813.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/joworugu.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/79122035018.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/firs89jv1gu5gdhgolei7pt1di/femujowazawujaxelorujavol.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161414ca09d458---nesedofiritufakudebinapa.pdfIn PDF document text
    • http://labonscafe.com/userfiles/9850091028.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422d0488dbb---nibazekubilusofilinatamuf.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/82650843346.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/77049778690.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/56542440075.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///48464136965.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/68555931537.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/86919234756.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/9021030143.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/63327427685.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/pozipowadudavivuluzoleto.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/16000654672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=why+my+phone+cannot+detect+5ghz+wifiPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1B 11140 bytes
SHA-256: c1dc0c430cd32a36baf987a141d5220dba69b9de3c04be187446285510fe5062
font_02_sfnt_off000125e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E3 19448 bytes
SHA-256: 6e5efb038f9a6b8df6b50fb0138a57e3e9e156f876bc4b94619309f910f3562a

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